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Fencer Intel
low 3.7

CVE-2013-4347 json

SimpleGeo python-oauth2 vulnerable to the use of Insufficiently Random Values to generate nonces

published 2014-05-20 12 y ago modified 2026-06-16 4 mo ago also GHSA-rv8h-p43r-4x5r , PYSEC-2014-86 , EUVD-2014-0039

cvss
3.7
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

The (1) make_nonce, (2) generate_nonce, and (3) generate_verifier functions in SimpleGeo python-oauth2 uses weak random numbers to generate nonces, which makes it easier for remote attackers to guess the nonce via a brute force attack.

Patch / fix

  • pypi oauth2 1.9rc1
  • v8 satellite capsule 6.1, satellite 6.1 1:3.14.5.10-11.el7sat
  • bsf satellite 6.1 2.4.0-19.el7
  • c3p0 satellite 6.1 0.9.1.2-3.ep6.el7
  • jsch satellite 6.1 0.1.50-5.el7
  • pulp satellite capsule 6.1, satellite 6.1 2.6.0.15-1.el7sat
  • sisu satellite 6.1 2.3.0-11.el7
  • cglib satellite 6.1 2.2-18.el7
  • gofer satellite capsule 6.1, satellite 6.1 2.6.2-2.el7sat

red hat advisories RHSA-2015:1591RHSA-2015:1592

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-4347 updated cvss 4.3

python-oauth2: Uses poor PRNG in nonce

  • Red Hat OpenStack Platform 4 python-oauth2
    affected: no fix planned “Will not fix”
  • Red Hat Satellite 6.1 jansi 1.9-7.el7, bsf 2.4.0-19.el7, cglib 2.2-18.el7, guava 13.0-6.el7, xbean 3.13-6.el7, hawtjni 1.6-9.el7, +782 more Red Hat Satellite Capsule 6.1 hiera 1.3.1-2.el7, hiera 1.0.0-3.el6_4, qpid-cpp 0.30-9.el6, qpid-cpp 0.30-9.el7, qpid-qmf 0.30-5.el6, qpid-qmf 0.30-5.el7, +268 more
    fixed: vendor fix RHSA-2015:1592
  • Red Hat CloudForms Management Engine 5 python-oauth2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.44% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
pypi oauth2
<1.9rc1
1.9rc1

Classification

Weakness
  • CWE-310 Cryptographic Issues
  • CWE-330 Use of Insufficiently Random Values

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.